Human Geography

Download Introduction to Geological Maps and Structures by John L. Roberts (Auth.) PDF

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By John L. Roberts (Auth.)

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Extra resources for Introduction to Geological Maps and Structures

Sample text

It assumes that the contact is a planar surface since the structure contours can only be drawn as straight lines, equally spaced and parallel to one another. The geological b o u n d a r y can then be drawn in using these structure contours, as previously described. Construction of Vertical Cross-sections. The exercises based on problem maps often require that a vertical crosssection should be drawn to illustrate the geological structure, using the structure contours which have been constructed from the outcrop pattern.

Folds vary in inclination according to the dip of their axial planes. However, it is particularly convenient to define the inclination of a fold as the direction opposite to the dip of its axial plane, as suggested by the everyday meaning of this word. Thus, a fold would be inclined towards the northwest if its axial plane dipped towards the south-east. General Classification of Fold Attitude. Any fold can be considered to vary in attitude according to the plunge of its fold hinge and the dip of its axial plane.

Folds vary in inclination according to the dip of their axial planes. However, it is particularly convenient to define the inclination of a fold as the direction opposite to the dip of its axial plane, as suggested by the everyday meaning of this word. Thus, a fold would be inclined towards the northwest if its axial plane dipped towards the south-east. General Classification of Fold Attitude. Any fold can be considered to vary in attitude according to the plunge of its fold hinge and the dip of its axial plane.

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